机械专业学生创新能力的培养

文章结合机械设计基础课程的教学与实践,深入地阐述了通过改革课程目标、整合课程内容和运用立体化结构的教学方式,以达到激发学生的创造欲望和充分利用发展创造力环境这一素质教育目标的教学模式与实践.     

我国高校领导体制的演变及思考

建国以来我国公立高校内部领导体制经历了7次变化,变化次数之多,实不多见.通过对这一演变过程的考察,我们可以就如下两方面得出若干结论:频繁变化的原因及启示;如何评价这一演变过程.     

Surface Waviness in Grinding of Thin Mould Insert Using Chilled Air as Coolant

On going trend of miniaturization in electronic rel at ed parts, which is an average of two times in every 5～7 years introduce grindin g challenges. In grinding process, the surface waviness control of thin parts is an ardent task due to its warpage, induced by the high specific grinding energy (2～10 J/mm 3). Therefore, coolant is often used to avoid thermal damage, obtai n better surface integrity and to prolong wheel life. However coolant, the incomp ressibility media introduce high forces at the gri...     

高校教学质量评价新模型研究

本文讨论教学质量评价新模型的设计思想和应用研究.     

高校扩招与教学质量的思考

高等教育的适度扩招是党中央、国务院审时度势,适应我国第三步战略目标做出的一项重大战略决策,既是党中央、国务院对我国教育改革和发展提出的总体要求,也符合高等教育的发展趋势,并满足了人民群众和社会各界对高等教育发展的迫切要求.……     

从教师的导向功能谈高校师德建设的重要性

教师肩负人才培养的神圣职责,在人才的培养过程中,不仅是学生求知的导师,而且是学生做人的引路人.在教育的过程中发挥着重要的道德导向、价值导向、思想政治导向等功能.因此我们必须充分认识加强高校教师的思想道德建设和提高教师队伍的整体水平的重要性,把它作为深化教育改革和推进素质教育的关键环节来抓,充分发挥教师在高校德育工作中的导向功能.     

加强和改进高校思想政治工作的思考

在经济全球化、社会信息化的背景下,人们思想观念不断发生新的变化.本文对新时期高校思想政治工作存在的问题及加强和改进思想政治工作的途径进行了探讨.     

从图式理论看提高英语阅读能力的有效途径

教学实践说明,学好一门外语,有效的阅读是绝对必要的.然而笔者从期末教学测试的结果中发现,大多数学生的阅读理解题失分过多.……     

Preferential hydrophobic interactions are responsible for a preference of D-amino acids in the aminoacylation of 5'-AMP with hydrophobic amino acids.

We have studied the chemistry of aminoacyl AMP to model reactions at the 3' terminus of aminoacyl tRNA for the purpose of understanding the origin of protein synthesis. The present studies relate to the D, L preference in the esterification of 5'-AMP. All N-acetyl amino acids we studied showed faster reaction of the D-isomer, with a generally decreasing preference for D-isomer as the hydrophobicity of the amino acid decreased. The beta-branched amino acids, Ile and Val, showed an extreme preference for D-isomer. Ac-Leu, the gamma-branched amino acid, showed a slightly low D/L ratio relative to its hydrophobicity. The molecular basis for these preferences for D-isomer is understandable in the light of our previous studies and seems to be due to preferential hydrophobic interaction of the D-isomer with adenine. The preference for hydrophobic D-amino acids can be decreased by addition of an organic solvent to the reaction medium. Conversely, peptidylation with Ac-PhePhe shows a preference for the LL isomer over the DD isomer.